Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

What is the value of this variable resistor ?
What is the value of this variable resistor ?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st November 2019, 03:54 PM   #1
Nounours18200 is offline Nounours18200  France
diyAudio Member
 
Join Date: Jan 2004
Location: GRASSE (France)
Default What is the value of this variable resistor ?

Hi,

I currently restore a GOLDMUND Mimesis 3 amplifier, and I have to change this variable resistor (see attached photo):

[IMG]Click the image to open in full size.[/IMG]

The following references are written on the part:

64Y 201
R601


Do you know what is the exact value: 200ohms, 600ohms ?

Thank you
P.S.: I know that I could measure it after desoldering, but as I am about to place an order for the other parts, I prefer to include this R with the order...
  Reply With Quote
Old 21st November 2019, 04:04 PM   #2
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Westende Resort, BE coast
Quote:
Originally Posted by Nounours18200 View Post
Hi,

I currently restore a GOLDMUND Mimesis 3 amplifier, and I have to change this variable resistor (see attached photo):

[IMG]Click the image to open in full size.[/IMG]

The following references are written on the part:

64Y 201
R601


Do you know what is the exact value: 200ohms, 600ohms ?

Thank you
P.S.: I know that I could measure it after desoldering, but as I am about to place an order for the other parts, I prefer to include this R with the order...
Seems 200 ohms, that is the typical way of labelling. You can measure without desoldering that will give you a close enough indication.

Jan
__________________
Cable: a potential source of trouble interconnecting two other potential sources of trouble - Erik Margan
Linear Audio articles - SilentSwitcher - Treg high voltage regulator - High-voltage delay unit
  Reply With Quote
Old 21st November 2019, 04:05 PM   #3
merlin el mago is offline merlin el mago  Europe
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe Union
I guess 200 ohms, take off and measure it to be sure.

xossed post Jan
  Reply With Quote
Old 21st November 2019, 05:49 PM   #4
Nounours18200 is offline Nounours18200  France
diyAudio Member
 
Join Date: Jan 2004
Location: GRASSE (France)
Thak you Jan , I also believe it is this value...

Quote:
You can measure without desoldering that will give you a close enough indication.
If I measure it without desoldering, the measured value should normally be impacted by the circuit it is connected to, shouldn't it ??
  Reply With Quote
Old 21st November 2019, 06:11 PM   #5
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Westende Resort, BE coast
Quote:
Originally Posted by Nounours18200 View Post
Thak you Jan , I also believe it is this value...



If I measure it without desoldering, the measured value should normally be impacted by the circuit it is connected to, shouldn't it ??
Hardly. The measurement current is small, and even if it isn't absolutely accurate, it's enough to see if it is 200R or 600R. Did you try?

BTW If this is connected as a rheostat (wiper connected to one side) make sure to record the position, then turn it to one side fully, then measure, then reset to value ;-)

Jan
__________________
Cable: a potential source of trouble interconnecting two other potential sources of trouble - Erik Margan
Linear Audio articles - SilentSwitcher - Treg high voltage regulator - High-voltage delay unit
  Reply With Quote
Old 21st November 2019, 06:58 PM   #6
lcsaszar is offline lcsaszar  Hungary
diyAudio Member
 
Join Date: Mar 2004
Location: Budapest, Hungary
Why do you have to change the VR if it's not broken?
  Reply With Quote
Old 22nd November 2019, 06:11 PM   #7
Nounours18200 is offline Nounours18200  France
diyAudio Member
 
Join Date: Jan 2004
Location: GRASSE (France)
Quote:
Did you try?
Not yet, but I will tomorrow : it has been a nightmare to open this device, but I finally succeeded...

Sometimes I believe that the manufacturer has done everything possible to make the maintenance as difficult as possible....


Quote:
Why do you have to change the VR if it's not broken?
Because I used to work with an engineer for restoring vintage devices, and he cannot get the amp stable because of a faulty VR.

I will change them, as I used to do these tasks very often...

Thank you
  Reply With Quote
Old 22nd November 2019, 07:18 PM   #8
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Westende Resort, BE coast
That is extremely unusual. You should be prepared for the fact that there actually is another issue.

Again, it is a no-brainer to verify if the VR still works as it should with a simple resistance meeting. Measure the resistance while turning it will very quickly show if there is a short or open.

Jan
__________________
Cable: a potential source of trouble interconnecting two other potential sources of trouble - Erik Margan
Linear Audio articles - SilentSwitcher - Treg high voltage regulator - High-voltage delay unit
  Reply With Quote
Old 22nd November 2019, 08:44 PM   #9
Nounours18200 is offline Nounours18200  France
diyAudio Member
 
Join Date: Jan 2004
Location: GRASSE (France)
Quote:
You should be prepared for the fact that there actually is another issue.
Yes I agree: the capacitors may also be faulty....
  Reply With Quote
Old 22nd November 2019, 09:44 PM   #10
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Westende Resort, BE coast
Quote:
Originally Posted by Nounours18200 View Post
Yes I agree: the capacitors may also be faulty....
Why do you think that? When you said, that there was a stability problem, what kind? Thermal? Oscillations?

Jan
__________________
Cable: a potential source of trouble interconnecting two other potential sources of trouble - Erik Margan
Linear Audio articles - SilentSwitcher - Treg high voltage regulator - High-voltage delay unit
  Reply With Quote

Reply


What is the value of this variable resistor ?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Variable Resistor values Karl vd Berg Parts 5 10th October 2013 07:14 PM
Resistor Variable, wirewound melpayumo Parts 2 16th April 2012 11:34 AM
Replacement for 200 Ohm variable resistor? maurycy Parts 5 8th April 2012 02:22 AM
variable resistor? studiostevus Digital Line Level 0 11th December 2010 09:28 AM
variable resistor akis Solid State 23 15th May 2010 07:44 PM


New To Site? Need Help?

All times are GMT. The time now is 03:06 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki